Since 1950, trick-or-treating Americans have raised money to help the United Nations bring immunization, nutrition, sanitation and education to children around the world. As they go door to door asking for candy, costumed kids also ask for small donations. To date, the effort has raised more than $144 million.
This year, to keep up with social media-savvy young people, UNICEF has made it possible to trick or treat with your cell phone. By texting "TOT" to UNICEF (864233), you can donate $5 to the campaign. A one-time $5 donation will be added to your phone bill.
Hotels and resorts are also experimenting with social media this Halloween.
Caesar's Palace in Las Vegas is offering a "Trick or Tweet" special to Twitter and Facebook users over Halloween weekend.
The casino will tweet messages from @CaesarsPalace announcing exclusive giveaways and food and drink specials for followers. The casino's Web site says costumes are encouraged but not required.
Marriott and Renaissance Caribbean & Mexico Resorts has also launched a "Trick or Tweet" promotion.
Each day, @MarriottResorts will tweet messages teasing giveaways for food, drinks, massages, meals and room nights.
"Take a break from pumpkin carving and bag some goodies... trick-or-treating is not just for kids anymore," the resort's Web site says.
Want to talk to Michael Jackson, Marilyn Monroe, William Shakespeare or another dead idol?
On Oct. 30 between 10 a.m. and noon (in the U.K.), self-proclaimed psychic medium Jayne Wallace, of Essex, England, will conduct an interactive séance on Twitter.
Through the micro-blogging site, Twitter users can nominate "departed spirits" they want Wallace to speak to. So far, the tweance page says Malcolm X, Charlie Chaplin, Audrey Hepburn and others have been picked.
During the tweance, Wallace will reach beyond the grave to ask questions of the celebrities with the most nominations.
According to the U.K.'s The Sun, a spokesman for London's costume shop Angels Fancy Dress in London, who came up the tweance, said, "We were amazed to see no one had used Twitter for a séance before."
Want to see what you look like as a gorilla or terminator without leaving your home?
A new Web site launched by Michigan-based Meijer lets you try on multiple masks while sitting at your home computer.
As long as you have a webcam attached to your PC, you can click through a menu of Halloween masks and see an image of yourself wearing the costumes you choose on your computer screen.
If you don't live in the area and have no plans to stop by the store to buy the mask, you can still have fun with the Web site.
MeijerHalloween.com lets users record a 30-second message, choose a "spooky voice" option and then share the minivideo with the digitally-altered voice via Facebook or e-mail.
"We're going for the wow factor," Brent Vargo, a Meijer marketing specialist, told The Toledo Blade. "The experience isn't necessarily for everyone ... It's going to be more of a youth-target demo or a technophile."